I havent bothered trying to compose in PT, I dont have any VSTi's installed, but then again, wouldnt they need to be RTAS instruments?
I could always try learning some FL just to use VST's in PT if I cant use vsti's directly from PT.
What I really like about PT is the way you can route busses.
And how you can export all the reason tracks into protools in a not too complicated, user friendly way.
I needed to bump this thread as a pro tools session has been driving me crazy today!